 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.views.tasklist;

 import java.util.List ;

 import org.eclipse.core.commands.operations.IUndoableOperation;
 import org.eclipse.core.resources.IMarker;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.TableViewer;
 import org.eclipse.swt.widgets.Table;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.ide.undo.DeleteMarkersOperation;
 import org.eclipse.ui.ide.undo.WorkspaceUndoUtil;
 import org.eclipse.ui.internal.views.tasklist.TaskListMessages;

 /**
  * This action removes the selected task(s) from the task list.
  * Only tasks can be removed. Problems can only disappear from
  * the task list when they are fixed in the associated code.
  */
 class RemoveTaskAction extends TaskAction {

     /**
      * Creates the action.
      *
      * @param tasklist the task list
      * @param id the id
      */
     public RemoveTaskAction(TaskList tasklist, String id) {
         super(tasklist, id);
         PlatformUI.getWorkbench().getHelpSystem().setHelp(this,
                 ITaskListHelpContextIds.REMOVE_TASK_ACTION);
     }

     /**
      * Removes all the tasks in the current selection from the task list.
      */
     public void run() {
         TaskList taskList = getTaskList();
         TableViewer viewer = taskList.getTableViewer();
         IStructuredSelection selection = (IStructuredSelection) viewer
                 .getSelection();
         if (selection.isEmpty()) {
             return;
         }
         taskList.cancelEditing();
         // get the index of the selected item which has focus
 Table table = viewer.getTable();
         int focusIndex = table.getSelectionIndex();
         List list = selection.toList();
         IMarker[] markers = new IMarker[list.size()];
         list.toArray(markers);
         IUndoableOperation op = new DeleteMarkersOperation(markers, TaskListMessages.RemoveTask_undoText);
         execute(op, TaskListMessages.RemoveTask_errorMessage, null,
                 WorkspaceUndoUtil.getUIInfoAdapter(getShell()));
         // set the selection to be the one which took the place of the one with focus
 int count = table.getItemCount();
         if (focusIndex < count) {
             table.setSelection(focusIndex);
         } else if (count != 0) {
             table.setSelection(count - 1);
         }
         // update the viewer's selection, since setting the table selection does not notify the viewer
 viewer.setSelection(viewer.getSelection(), true);
     }
 }

